Provide an appropriate response.If a parabola opens downward, the highest point on the graph is called the 
of the parabola.
A. top
B. axis
C. vertex
D. middle point
Answer: C
Mathematics
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Use a sum-to-product identity to rewrite the expression.sin 50° - sin 44°
A. 2 cos 47° cos 3° B. 2 cos 47° sin 3° C. -2 sin 47° sin 3° D. 2 sin 47° cos 3°
Mathematics
Find the equation of the tangent line to the curve when x has the given value.f(x) = 
; x = 4
A. y = 
+ 
B. y = - 
+ 
C. y = -39x - 80
D. y = 13x - 16
Mathematics
Find the focus and directrix of the parabola with the given equation.x2 = -16y
A. focus: (0, -4) directrix: y = -4 B. focus: (0, 4) directrix: y = -4 C. focus: (0, -4) directrix: y = 4 D. focus: (-8, 0) directrix: x = 4
Mathematics
If 
, write the expression 
in terms of just x.
?
A. 
B. 
C. 
D. 
E. 
Mathematics